期刊
JOURNAL OF CHEMICAL PHYSICS
卷 135, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3664864
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资金
- U.S. Department of Energy (DOE) [DE-FG02-02ER15306]
- National Science Foundation (NSF) [CHE 0910488]
- National Aeronautics and Space Administration (NASA) [07-PATM07-0012]
- Air Force Office of Scientific Research (AFOSR) [FA9550-06-1-0073]
- U.S. Department of Energy (DOE) [DE-FG02-02ER15306] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien [0910488] Funding Source: National Science Foundation
- Division Of Chemistry [0910488] Funding Source: National Science Foundation
By employing the vacuum ultraviolet (VUV) laser velocity-map imaging (VMI) photoelectron scheme to discriminate energetic photoelectrons, we have measured the VUV-VMI-threshold photoelectrons (VUV-VMI-TPE) spectra of propargyl radical [C3H3((X) over tilde B-2(1))] near its ionization threshold at photoelectron energy bandwidths of 3 and 7 cm(-1) (full-width at half-maximum, FWHM). The simulation of the VUV-VMI-TPE spectra thus obtained, along with the Stark shift correction, has allowed the determination of a precise value 70 156 +/- 4 cm(-1) (8.6982 +/- 0.0005 eV) for the ionization energy (IE) of C3H3. In the present VMI-TPE experiment, the Stark shift correction is determined by comparing the VUV-VMI-TPE and VUV laser pulsed field ionization-photoelectron (VUV-PFI-PE) spectra for the origin band of the photoelectron spectrum of the (X) over tilde (+)-(X) over tilde transition of chlorobenzene. The fact that the FWHMs for this origin band observed using the VUV-VMI-TPE and VUV-PFI-PE methods are nearly the same indicates that the energy resolutions achieved in the VUV-VMI-TPE and VUV-PFI-PE measurements are comparable. The IE(C3H3) value obtained based on the VUV-VMI-TPE measurement is consistent with the value determined by the VUV laser PIE spectrum of supersonically cooled C3H3((X) over tilde B-2(1)) radicals, which is also reported in this article. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3664864]
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